<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <input type="text" placeholder="用户名" v-model="user.username">
    <input type="text" placeholder="密码" v-model="user.password">
    <input type="text" placeholder="昵称" v-model="user.nick">
    <input type="button" value="注册" @click="f1()">
</div>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script>

        let v=new Vue({
                el:"body>div",
                data:{
                    user:{
                        username:"",password:"",nick:""
                    }
                },
                methods:{
                    f1(){
                        axios.post("/reg",v.user).then(function (response) {
                            if (response.data==1){
                                alert("注册成功")
                            }else {
                                alert("用户已存在！")
                            }
                        })
                    }
                }
            })

</script>
</body>
</html>